302 MR. BRODERIP ON THE GENUS CHAMA. 
variety is infinite, and I enter upon the task of describing the following specimens 
brought home by Mr. Cuming, and now in his cabinet, with considerable diffidence. 
CHAMA FRONDOSA. 
Tab. XXXVIII. Fig. 1. 
Chama testé sublobatd, lamellosd, lamellis sinuosis frondosis, frondibus longitudinahiter pli- 
catis et in utrdque valvd cardinem versus biseriatis, maximis ; intus albd, limbo purpu- 
rascente, crenulato. 
Hab. ad Insulam Platam Colombiz Occidentalis. 
The ground colour of this beautiful Chama is a light pinkish purple, and the luxu- 
riant and spreading longitudinally-plaited foliations are yellow, tinged and streaked with 
the ground colour. At the root of each foliation on its lower side there is generally a 
purplish transverse stripe. The inside of the valves is whitish, and their internal edge, 
which is crenulated all round, is bordered with dark purple, blending into yellow at the 
verge, but more intense at the posterior edge. 
The specimen from which the figure and description were taken was dredged up by 
Mr. Cuming from a rock of coral, to which it was adhering at a depth of seventeen 
fathoms. 
Var. «. Lamellis crebrioribus, frondibus brevioribus. 
Hab. cum precedente. 
Found attached to coral at the same island where the specimen last described was 
obtained, and at about the same depth. ‘ 
Var. 8. Tota purpurea, lamellis creberrimis, frondibus brevissimis. 
Tab. XXXVIII. Fig. 2. 
Hab. ad Mexico. (Gulf of Tehuantepec.) 
Dredged up from sandy mud attached to Avicule (Meleagrine, Lam., Margarite, 
Leach), at a depth of ten fathoms. 
Traces of the lobated form and double series of foliations near the hinge will be per- 
ceived more clearly in variety «. than in variety 6. ; still I think that the latter is only 
another variety of Chama frondosa. Traces of the yellow colour may be seen, especially 
near the wmbo. 
CHAMA PELLUCIDA. 
Tab. XXXVIII. Fig. 3. 
Chama testa alba roseo seu rubro fucaté vel strigatd, lamellis frequentibus, frondibus elon- 
gatis pellucidis ; intus albd, limbo crenulato. 
Hab. ad Peruviam. (Iquiqui.) 
This pretty species, when perfect, has its white, ruddy, or vinous elongated foliations 
